Add implementation 18.4 - 18.5

accounts/admin.py

+from django.contrib import admin
+
+# Register your models here.

accounts/apps.py

+from django.apps import AppConfig
+
+
+class AccountsConfig(AppConfig):
+    name = 'accounts'

accounts/authentication.py

+import sys
+from accounts.models import ListUser, Token
+
+class PasswordlessAuthenticationBackend(object):
+
+    def authenticate(self, request, uid):
+        print('uid', uid, file=sys.stderr)
+        if not Token.objects.filter(uid=uid).exists():
+            print('no token found', file=sys.stderr)
+            return None
+        token = Token.objects.get(uid=uid)
+        print('got token', file=sys.stderr)
+        try:
+            user = ListUser.objects.get(email=token.email)
+            print('got user', file=sys.stderr)
+            return user
+        except ListUser.DoesNotExist:
+            print('new user', file=sys.stderr)
+            return ListUser.objects.create(email=token.email)
+
+
+    def get_user(self, email):
+        return ListUser.objects.get(email=email)
\ No newline at end of file

accounts/migrations/0001_initial.py

+# Generated by Django 2.2.5 on 2019-11-13 11:32
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='User',
+            fields=[
+                ('email', models.EmailField(max_length=254, primary_key=True, serialize=False)),
+            ],
+        ),
+    ]

accounts/migrations/0002_token.py

+# Generated by Django 2.2.5 on 2019-11-13 11:33
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('accounts', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Token',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('email', models.EmailField(max_length=254)),
+                ('uid', models.CharField(max_length=40)),
+            ],
+        ),
+    ]

accounts/models.py

+from django.db import models
+import uuid
+
+class Token(models.Model):
+    email = models.EmailField()
+    uid = models.CharField(default=uuid.uuid4, max_length=40)
+
+class User(models.Model):
+	email = models.EmailField(primary_key=True)
+
+	REQUIRED_FIELDS = []
+	USERNAME_FIELD = 'email'
+	is_anonymous = False
+	is_authenticated = True
\ No newline at end of file

accounts/tests/test_models.py

+from django.test import TestCase
+from django.contrib.auth import get_user_model
+from accounts.models import Token
+
+User = get_user_model()
+
+class TokenModelTest(TestCase):
+
+    def test_links_user_with_auto_generated_uid(self):
+        token1 = Token.objects.create(email='a@b.com')
+        token2 = Token.objects.create(email='a@b.com')
+        self.assertNotEqual(token1.uid, token2.uid)
+
+class UserModelTest(TestCase):
+
+    def test_user_is_valid_with_email_only(self):
+        user = User(email='a@b.com')
+        user.full_clean()  # should not raise
+
+    def test_email_is_primary_key(self):
+    	user = User(email='a@b.com')
+    	self.assertEqual(user.pk, 'a@b.com')
\ No newline at end of file

accounts/urls.py

+from django.conf.urls import url
+from accounts import views
+
+urlpatterns = [
+    url(r'^send_email$', views.send_login_email, name='send_login_email'),
+    url(r'^login$', views.login, name='login'),
+    url(r'^logout$', views.logout, name='logout'),
+]
\ No newline at end of file

accounts/views.py

+from accounts.models import Token
+import uuid
+import sys
+from django.contrib.auth import authenticate
+from django.contrib.auth import login as auth_login, logout as auth_logout
+from django.core.mail import send_mail
+from django.shortcuts import redirect, render
+
+def login(request):
+    print('login view', file=sys.stderr)
+    uid = request.GET.get('uid')
+    user = authenticate(uid=uid)
+    if user is not None:
+        auth_login(request, user)
+    return redirect('/')
+
+def logout(request):
+    auth_logout(request)
+    return redirect('/')
+
+def send_login_email(request):
+    email = request.POST['email']
+    uid = str(uuid.uuid4())
+    Token.objects.create(email=email, uid=uid)
+    print('saving uid', uid, 'for email', email, file=sys.stderr)
+    url = request.build_absolute_uri(f'/accounts/login?uid={uid}')
+    send_mail(
+        'Your login link for Superlists',
+        f'Use this link to log in:\n\n{url}',
+        'noreply@superlists',
+        [email],
+    )
+    return render(request, 'login_email_sent.html')
\ No newline at end of file

lists/templates/base.html

@@ -13,6 +13,17 @@
 	<body>
 		​<div class="container">
 
+			<nav class="navbar navbar-default" role="navigation">
+			    <div class="container-fluid">
+			      <a class="navbar-brand" href="/">Superlists</a>
+			      <form class="navbar-form navbar-right" method="POST" action="#">
+			        <span>Enter email to log in:</span>
+			        <input class="form-control" name="email" type="text" />
+			        {% csrf_token %}
+			      </form>
+			    </div>
+			  </nav>
+			
 			​<div class="row">
 				​<div class="col-md-6 col-md-offset-3 jumbotron">
 					​<div class="text-center">

superlists/settings.py

@@ -41,8 +41,11 @@ INSTALLED_APPS = [
     'django.contrib.staticfiles',
     'lists',
     'django_mutpy',
+    'accounts',
 ]
 
+AUTH_USER_MODEL = 'accounts.User'
+
 MIDDLEWARE = [
     'whitenoise.middleware.WhiteNoiseMiddleware',
     'django.middleware.security.SecurityMiddleware',